The nerve rings twice.

A second round of nociceptor activation within 3-12 hours licenses an IL-23-centered inflammatory program via CGRPα in skin inflammation.

• Why it matters: Understanding how neural activity influences skin inflammation can reveal new targets for treating inflammatory conditions. The mechanisms linking nociceptor activation to immune responses are not fully understood, especially regarding the timing and molecular pathways involved.
• What they did: Chen et al. examined the effects of repeated nociceptor activation, showing that one activation creates a transient dendritic cell-rich neighborhood dependent on chemokine CCL2, while a second activation within 3-12 hours triggers an IL-23-centered response through neuropeptide CGRPα.
• The result: This work suggests that timing of nociceptor activation critically influences skin immune responses, with the second activation enabling an IL-23-driven program, potentially informing therapeutic strategies for inflammatory skin diseases.